Dangerous XSS vulnerability found on YouTube – the vulnerability explained

On the 4th of July 2010 YouTube users began complaining that their videos had been hijacked, the comments section of their videos seemed to be most severely affected, many complained that old comments vanished and new comments could not be added. Others reported that offensive messages were popping up on their screen or scrolling horizontally in large fonts and striking colors. Some users also seemed to suggest that there were experiencing page redirects, often to sites promoting pornographic content.

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